Method of demodulating digitally modulated signals, and apparatus implementing such a method
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United States of America Patent
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Dec 5, 1989
Grant Date -
N/A
app pub date -
May 23, 1988
filing date -
May 21, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A signal may be demodulated without using any analog components by using a digital processor. A digitizer delivers the amplitude of the signal to be demodulated at a sampling rate. The signal is acquired from the digitizer and stored in a common memory. The amplitude samples are converted to phase samples. Symbol rate phase hypotheses are generated for splitting the time signal into slices. The carrier phase for one symbol is then calculated for each symbol rate phase hypothesis so that the carrier phase can be estimated over a plurality of (S) symbols. The symbol phase is compared to the carrier phase so that the demodulated signal may be extracted and so that the quality of the demodulation may be estimated.
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